[llvm] [CI] Add Initial Wiring for Premerge Advisor Explanations (PR #164132)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> What is the pre-merge advisor?

There's a mostly finished but still in progress design doc at https://github.com/llvm/llvm-zorg/pull/599. Essentially it's a system that looks at premerge failures and will let you know if they're safe to ignore because they are either failing or flaky at head.

https://github.com/llvm/llvm-project/pull/164132